Cryogenic thermometer

[imsmooth]

I made an accurate (0.1F) LCD cryogenic thermometer for one of my projects. It goes down to -400F using an RTD probe. I am curious if I put together a kit, or just assembled one, would anyone be interested in buying these? Does anyone have a need for a low-cost cryogenic thermometer?

I am thinking of getting a 3d printer to make the enclosure and thought this would be a good project to start with.

[tool_462]

Pics? More details?

[imsmooth]

I have to get a 3d printer to make a professional casing. I can post a picture tomorrow of the current version in a standard project box. All the parts have 15ppm temperature drift and is accurate to 0.1F. I have to total the parts, but it will be close to $100. The unit will run off an AC/DC wall adapter. Units that don't even get to cryogenic temperatures sell for over $300 on mcmaster-carr
http://www.mcmaster.com/#digital-thermometers/=rwc6am

[G.Foyle]

I'd be interested in seeing the design. I would also gladly sacrifice some accuracy (0.5 C / 1 F accuracy should be enough for most overclockers) if it meant a significant cost reduction.

[TatmMRKRIVE]

I need a thermometer.

[I.nfraR.ed]

There are cheaper 2-channel thermometers with data logging and other advanced functions, so I don't think there will be a big interest, if any.
If it was $20, then maybe.

Just an example: UNI-T UT322

[crio]

The one you posted (UNI-T UT322) how quick is it?

edit:

Function UT321 UT322 UT323 UT325 Input
Protection
Measurement
Accuracy
30V
Below -10?C: add 0.5?C
Below -200?C, add +2?C
Type T Below -200?C: for reference only.
50 times per second, Updates 2-3 times per second
Relative Time
0 ~ 99 sets
Logging Interval, Thermocouple Type, Offset (T1),
Offset (T2) (UT322 and UT325 only), Sleep Mode,
Line Frequency, Time, High/Low Limit (UT323 and
UT325 only), Over Limit Signal Output (UT323 and
UT325 only), Normal Temperature Compensation,
Debug (UT323 and UT325 only)
N/A Yes
N/A Yes
One piece of 9V (NEDA1604 or 6F22 or 006P)